1.Checking the specification

Collect the specifications, which are based on machine manufacturing.

1.Work

---Check the tact time, transferring time and force of work.

2.Space

---Confirm the machine or unit size of width, height, depth.

3.Circumstances environment

---Check the temperature, humidity, environment conditions.

4.Others

---Checking the other conditions. (unit life, durability)

2. Deciding the transmission constructor

Deciding efficiency driver such as hydraulic, pneumatic, electric, engine. Confirm the construction and system, which suitable to achieve the required accuracy.

3.Selecting the driver (in case of motor)

Torque

Calculate the torque form r.p.m and motor torque line when you found motor capacity, there is reduction gear or not, and reduction gear rate. If there are no information of motor, then please use the standard formula below.

Thrust

Torque / Thrust

Calculate by using general formula below when it has toque and thrust load together and compare with allowable maximum torque capacity of Mecha-lock.

< Torque up>

1. Use more than one Mecha-lock. (for only MT MKT)
   Mecha-lock can be increase the transmission torque capacity by Mecha-lock numbers. (Hub outer diameter will be different for several use of Mecha-lock.)
        (Example) 2 pcs --- 2 times 3pcs --- 3 times
   
   MA MSA MKA MR MSR MKR can be install more than 2pcs, however uninstall operation can be hard.
2. Clean the oil of the bore of Mecha-lock and shaft surface.
   Transmission torque should be increased 10% to 20%.
   Note) Taper surface and outer ring of Mecha-lock should not be cleaned.
3. Customized Mecha-lock
   Please contact us for the customized products. ISEL will suggest and design the suitable specification.

<Torque down>

1. If there is the key groove on the shaft, in this case contact area is decreased and 15% to 20% of transmission torque could be down.
2. If Mecha-lock has been cleaned totally then screw axis force could be decreased.
   In this case transmission torque could be down over 30%.
   
   Point Please be aware of sand burning of stainless type of Mecha-lock MSA MSR.
3. Depending on the oil and chemical, friction could be decreased 50% if it is on bore of Mecha-lock and shaft surface.

4.Specification check of shaft and hub

Shaft

1. Tolerance of install shaft and surface roughness.
   
   
   Point For small off centering, h6 is recommended.
2. Shaft material
   Select the material which has shaft contact surface pressure number of each Mecha-lock series in catalogue × 1.2 yield point.
   (*)Select more than1.4 yield pint material for MT and MR series.
3. The maximum hollow shaft boreT
   Calculate maximum bore by formula below if hollow shaft is chosen for Mecha-lock installation.
   

Hub

1. Hub material
   Select the material which has hub contact surface pressure number of each Mecha-lock series in catalogue × 1.2 yield point.
   (*)Select more than1.4 yield pint material for MT and MR series.
   
   Select a hub material which is stronger yield strength and tensile strength than table below in case of using aluminum and cast iron hub FCD450.
   New MC series are recommended for aluminum hub.
2. Tolerance of install Hub and surface roughness.
   
   
   For reducing off centering, h6 is recommended.
3. Standard design for the smallest outer diameter of hub. (Standard yield stress point)
   Check the table of yield stress point of hub material and the smallest diameter on each page of Mecha-lock to confirm. If the material is not on table then calculate and judge from yield stress point. Especially careful with cast iron and aluminum. Contact us if you are not clear about the election.
4. If hub outer diameter is small and not suitable.
   Number of screws can be decreased to reduce the pressure if the torque is enough. Take out a screws in even location and use the comparison calculation to find the torque and surface pressure.
5. Design and processing of hub.

Note for the hub processing of single taper Mecha-lock series.

Processed the hub end and bore at the same time to have right angle. This angle effects on centering accuracy of Mecha-lock. (Fig.1)
Hub edge should be processed C0.5 to avoid contact with flange and in-low part of R. (Fig.2)

Note for MA,MSA,MKA and MB installation.

Over 1.0mm space is required between step and back if there is positioning step at back of hub. (If there is no space, large force will be required for disassembling. This might cause the deformation of inner ring flange and can not reuse this Mecha-lock again.)(Fig.3)

Note for the hub processing of MT and MKT series.

Guiding part is required for MT and MK series due to no centering function. Process the hub with step as below fig4 for guide the Mecha-lock.
(*)The same installation for 2 Mecha-locks application.

Note for design of MN·MKN series if space is not enough for hub width.

Hub width should be 1/2 of Mecha-lock MN·MKN L1 size. (Fig.5)
(*)Hub width capacity should be over B=L1/2.
(*)Mecha-lock can be used if hub surface pressure L1/B<hub surface
    pressure 196MPa(20Kgf/mm²).
(*)Hub location should be center of L1 or nut side if hub width is shorter
    than Mecha-lock L1.

Note) Only MN MKS series can be used even if L1 is shorter.

5.Selection of Mecha-lock series

Select the suitable Mecha-lock considering of application, space, operation, specification, etc with selection guide. (The feature of each couplings are top of the page.)
Electro less nickel plating and stainless type are added. Also aluminum Mecha-lock for aluminum pulley has been released.

6.Checking the load

1. Bend moment to Mecha-lock.
   Basically Mecha-lock can not receive bend moment.
   However Mecha-lock can be used by changing the load receiving location or design of hub.
   
   Shaft slipping or shaft or Mecha-lock break by bend moment load to Mecha-lock if radial direction load is not on outer diameter of Mecha-lock.(Fig.6)
   Bent moment can be received by increase contact area between hub and shaft or move the Mecha-lock connection location or change the design of hub.(Fig.7)
2. Radial load to Mecha-lock.
   Calculate the capacity with the formula below if radial load is on to Mecha-lock.
   Radial road can be received if shaft surface pressure Pir and Hub surface pressure Por by radial load R are less than 20% of Normal connection surface pressure (P)(catalogue number).
   

7.Final Check

Check and confirm the Mecha-lock selection and specification.
Please check step 1 to step 6 again for suitability.
If there are no problems, then please check the following points.

Installation depth of shaft and hub

It should be the best that shaft go through the Mecha-lock. However make sure that shaft must be reached to taper point (the location where flange or nut reach to shaft edge). Otherwise Mecha-lock could be deformed and use it again.
Decide the shaft installation amount to hub with considering of moment capacity and install operation. (for example processing which hide the screw head from hub edge, and use the Mecha-lock in center of radial load.)

Balance

Mecha-lock is not basically balanced, because Mecha-lock can not be used itself. We recommend customer to balance the unit after assembly of hub, shaft, and Mecha-lock.
Application of more than 6000min high speed rotation, we suspect the transmission force reduction will be occurred.

Temperature circumstances

Mecha-lock should be used from –40 to +150°C.
(*)MC series should be used from –40 to +80°C(we suspect the transmission torque reduction will be occurred.)

Reuse

Mecha-lock can be reused more than 30 times under the right installation and condition. However screw and screw face will be scratched and this may case of the specification reduction from 100%. In this case we recommend to change the screw to new after 3 times.

8.Check the purchasing price

Mecha-lock has been designed as simple to reduce the cost. Also we keep the good quality and high accuracy by our original processing to produce high performance unit.
Please ask your near distributor for quotation.

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